Sample view controller that does not worry about the table view presentation details.

DogsViewController.swift

//
//  DogsViewController.swift
//  MediumSamples
//
//  Created by Fernando Ortiz on 1/3/17.
//  Copyright © 2017 Fernando Martín Ortiz. All rights reserved.
//

import UIKit

class DogsViewController: UIViewController {

    // MARK: - Views -
  
    // 1
    @IBOutlet weak var tableView: UITableView!
    
    // MARK: - Drivers -
    
    // 2
    var tableViewDriver: DogsTableViewDriver!
    
    // MARK: - Life cycle -
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 3
        tableViewDriver = DogsTableViewDriver(tableView: tableView)
        tableViewDriver.delegate = self
        
        loadDogs()
    }
    
    func loadDogs() {
        DataProvider.getDogs { [weak self] (result: Result<[Dog]>) in
            switch result {
                
            case .success(let dogs):
                // 4
                self?.tableViewDriver.reload(with: dogs)
                
            case .error(let error):
                print("Something went wrong. Reason: \(error.localizedDescription).")
                
            }
            
        }
    }

}

// 5
extension DogsViewController: DogsTableViewDriverDelegate {
    func didSelectedDog(_ dog: Dog) {
        // Here we think in terms of high abstraction level data.
    }
}